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Algae, Fungi and Mosses Lab Manual Table of Contents

Order Eubryales

The members of this order generally have gametophytes and sporophytes that are less complex than those of the order Polytrichales. However the members of the Eubryales are still very diverse morphologically. Unlike the leaves of the Polytrichales, the leaves of the Eubryales are generally unistratose and simple. Members of this order can be divided into two groups, "Acrocarpous" mosses which bear the sporophytes at the apex of the stem, and "Pleuocarpous" mosses in which the sporophytes are borne on lateral branches.

In this lab you will examine two representative members of this order. The life cycles of these species are not unlike that of the Polytrichales, so concentrate on the different morphology of this order.

Mnium sp. (An Acrocarpous Moss)

Bryum sp.

- Examine the long section slides of the archegonia, antheridia and sporophyte. Note the characteristic structure of the archegonia and antheridia and the perichaetal leaves and paraphyses. In the sporophyte slide note the capsule, sterile cells of the capsule wall, columella, and spores. Also examine the slide of the protonema.

antheridia

archegonia

- Examine the stages of the life history and identify the male gametophyte. Note the morphology of the leaves, stems, rhizoids. Examine the sporophyte, and find the capsule, operculum, and stalk (seta).

- Examine the slide of the leaves of . Note the unistratose blade and costa with vein-like central cylinder.

- You will also find several other moss species on display. Examine these and examine the characteristic features. If time permits you may wish to dissect some of these.

Mnium sp.

protonema.

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University of Winnipeg Kent Simmons

Algae, Fungi and Mosses Lab Manual Table of Contents

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